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我嘗試發送圖像文件到網絡服務器，我按照現有的教程，但是當我執行這個方法時，我有一個錯誤。我從數據庫調用路徑圖像，因此本地名稱中與圖像數據庫相同的所有圖像都可以上傳。我喜歡這種方法：發送圖像文件到網絡服務器
private void doFileUpload(){
HttpURLConnection conn = null;
DataOutputStream dos = null;
DataInputStream inStream = null;
Cursor c = helper.getUpImage(almagId);
c.moveToFirst();
String existingFileName = helper.getGam1(c);
String lineEnd = "\r\n";
String twoHyphens = "--";
String boundary = "*****";
int bytesRead, bytesAvailable, bufferSize;
byte[] buffer;
int maxBufferSize = 1*1024*1024;
String responseFromServer = "";
String urlString = "http://10.234.165.232/uploader.php";
try
{
//------------------ CLIENT REQUEST
FileInputStream fileInputStream = new FileInputStream(new File(existingFileName));
// open a URL connection to the Servlet
URL url = new URL(urlString);
// Open a HTTP connection to the URL
conn = (HttpURLConnection) url.openConnection();
// Allow Inputs
conn.setDoInput(true);
// Allow Outputs
conn.setDoOutput(true);
// Don't use a cached copy.
conn.setUseCaches(false);
// Use a post method.
conn.setRequestMethod("POST");
conn.setRequestProperty("Connection", "Keep-Alive");
conn.setRequestProperty("Content-Type", "multipart/form-data;boundary="+boundary);
dos = new DataOutputStream(conn.getOutputStream());
dos.writeBytes(twoHyphens + boundary + lineEnd);
dos.writeBytes("Content-Disposition: form-data; name=\"uploadedfile\";filename=\"" + existingFileName + "\"" + lineEnd);
dos.writeBytes(lineEnd);
// create a buffer of maximum size
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
buffer = new byte[bufferSize];
// read file and write it into form...
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
while (bytesRead > 0)
{
dos.write(buffer, 0, bufferSize);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
}
// send multipart form data necesssary after file data...
dos.writeBytes(lineEnd);
dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
// close streams
Log.e("Debug","File is written");
fileInputStream.close();
dos.flush();
dos.close();
}
catch (MalformedURLException ex)
{
Log.e("Debug", "error: " + ex.getMessage(), ex);
}
catch (IOException ioe)
{
Log.e("Debug", "error: " + ioe.getMessage(), ioe);
}
//------------------ read the SERVER RESPONSE
try {
inStream = new DataInputStream (conn.getInputStream());
String str;
while ((str = inStream.readLine()) != null)
{
Log.e("Debug","Server Response "+str);
}
inStream.close();
}
catch (IOException ioex){
Log.e("Debug", "error: " + ioex.getMessage(), ioex);
}
}
這是我的錯誤
03-08 13:49:46.174: ERROR/AndroidRuntime(1277): FATAL EXCEPTION: main
03-08 13:49:46.174: ERROR/AndroidRuntime(1277): java.lang.NullPointerException
03-08 13:49:46.174: ERROR/AndroidRuntime(1277): at com.sat.alfaloc.MenuUtama.doFileUpload(MenuUtama.java:232)
03-08 13:49:46.174: ERROR/AndroidRuntime(1277): at com.sat.alfaloc.MenuUtama.onOptionsItemSelected(MenuUtama.java:113)
03-08 13:49:46.174: ERROR/AndroidRuntime(1277): at android.app.Activity.onMenuItemSelected(Activity.java:2195)
03-08 13:49:46.174: ERROR/AndroidRuntime(1277): at com.android.internal.policy.impl.PhoneWindow.onMenuItemSelected(PhoneWindow.java:730)
03-08 13:49:46.174: ERROR/AndroidRuntime(1277): at com.android.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:143)
03-08 13:49:46.174: ERROR/AndroidRuntime(1277): at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:855)
03-08 13:49:46.174: ERROR/AndroidRuntime(1277): at com.android.internal.view.menu.IconMenuView.invokeItem(IconMenuView.java:532)
03-08 13:49:46.174: ERROR/AndroidRuntime(1277): at com.android.internal.view.menu.IconMenuItemView.performClick(IconMenuItemView.java:122)
03-08 13:49:46.174: ERROR/AndroidRuntime(1277): at android.view.View$PerformClick.run(View.java:8816)
03-08 13:49:46.174: ERROR/AndroidRuntime(1277): at android.os.Handler.handleCallback(Handler.java:587)
03-08 13:49:46.174: ERROR/AndroidRuntime(1277): at android.os.Handler.dispatchMessage(Handler.java:92)
03-08 13:49:46.174: ERROR/AndroidRuntime(1277): at android.os.Looper.loop(Looper.java:123)
03-08 13:49:46.174: ERROR/AndroidRuntime(1277): at android.app.ActivityThread.main(ActivityThread.java:4627)
03-08 13:49:46.174: ERROR/AndroidRuntime(1277): at java.lang.reflect.Method.invokeNative(Native Method)
03-08 13:49:46.174: ERROR/AndroidRuntime(1277): at java.lang.reflect.Method.invoke(Method.java:521)
03-08 13:49:46.174: ERROR/AndroidRuntime(1277): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
03-08 13:49:46.174: ERROR/AndroidRuntime(1277): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
03-08 13:49:46.174: ERROR/AndroidRuntime(1277): at dalvik.system.NativeStart.main(Native Method)
我不知道發生了什麼我code.I認爲這是correct.Anyone能幫助我嗎？
請指定com.sat.alfaloc.MenuUtama類中doFileUpload（...）方法中哪一行是232行。第232行的 – 2012-03-08 07:15:06
是這個'inStream = new DataInputStream（conn.getInputStream（））;'..謝謝你 – akubabas 2012-03-08 07:41:37